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[" 18.If the conjugate of "(x+iy)(1-2i)"...

[" 18.If the conjugate of "(x+iy)(1-2i)" be "1+i],[" then "-],[[" (A) "x=(1)/(5)," (B) "y=(3)/(5)],[" (C) "x+iy=(1-i)/(1-2i)," (D) "x-iy=(1-i)/(1+2i)]]

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